Hey guys, im starting a new pc build and im completely new to building, itll be and experience. Ill be upgrading from and Alienware M17X-R4. My problem is that im a little confused about how many watts ill need in a psu. My system specs COOLER MASTER CM Storm Scout 2, Seagate Barracuda 7200.14 ST3000DM001 3TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive, Dual ASUS GTX660 TI-DC2O-2GD5 GeForce GTX 660 Ti 2GB, CORSAIR Vengeance 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1600, MSI Z77A-G45 Gaming LGA 1155 Intel Z77, Intel Core i5-3570 Ivy Bridge 3.4GHz (3.8GHz Turbo Boost) LGA 1155 77W and an Intel 520 Series Cherryville SSDSC2CW120A3K5 2.5" 120GB. Any help would be appreciated.